package com.example.travelhelper.interceptors;

import com.auth0.jwt.exceptions.AlgorithmMismatchException;
import com.auth0.jwt.exceptions.SignatureVerificationException;
import com.auth0.jwt.exceptions.TokenExpiredException;

import com.example.travelhelper.utils.JwtUtil;
import com.fasterxml.jackson.databind.ObjectMapper;

import org.springframework.stereotype.Component;
import org.springframework.web.servlet.HandlerInterceptor;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.util.HashMap;
import java.util.Map;
@Component
public class JwtInterceptor implements HandlerInterceptor {
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        // 判断有没有admin_token   如果没有
//        System.out.println("拦截");
                Map<String,Object> map = new HashMap<>();
        //获取请求头中的令牌
        String token = request.getHeader("Admin_token");
        if(token==null||token.length()<=0) {
            return true;
        }
        else{
            try {
                JwtUtil.verify(token);//验证令牌
                return true;
            }catch (SignatureVerificationException e){
                e.printStackTrace();
                map.put("msg", "无效签名！");
            }catch (TokenExpiredException e){
                e.printStackTrace();
                map.put("msg", "token过期！");
            }catch (AlgorithmMismatchException e){
                e.printStackTrace();
                map.put("msg", "token算法不一致！");
            }catch (Exception e){
                e.printStackTrace();
                map.put("msg", "token无效！");
            }
            map.put("status", 401);
            String json = new ObjectMapper().writeValueAsString(map);
            response.setContentType("application/json;charset=UTF-8");
            response.getWriter().println(json);

            return false;
        }

    }
}
